Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of BlueLinx Holdings Inc. and its wholly owned subsidiaries (the “Company”). These financial statements have been prepared in accordance with the instructions to Form 10-Q and do not include all of the information and footnotes required by accounting principles generally accepted (“GAAP”) in the United States (“U.S.”) for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These statements should be read in conjunction with the Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K (the “Annual Report on Form 10-K”) for the year ended December 30, 2017, as filed with the Securities and Exchange Commission on March 1, 2018. Recently Adopted Accounting Standards Revenue from Contracts with Customers. In 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers (Topic 606) (“ASC 606”).” Under this ASU and subsequently issued amendments, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration received. Entities may use a full retrospective approach or report the cumulative effect as of the date of adoption. On December 31, 2017, the first day of our fiscal 2018 year, we adopted ASC 606 using the modified retrospective method applied to those contracts which were not completed as of that date. Results for reporting periods beginning after the first day of fiscal 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported in accordance with our historic accounting under ASC 605. There was no adjustment due to the cumulative impact of adopting ASC 606. See Note 2, “Revenue Recognition,” for more information. Standards Effective in Future Years Leases. In 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842).” This standard will require leases with durations greater than twelve months to be recognized on the balance sheet and is effective for interim and annual reporting periods beginning after December 15, 2018. We will adopt this standard effective January 1, 2019. We have not completed our assessment, but the adoption of this standard may have a significant impact on our Consolidated Balance Sheets. However, we do not expect the adoption to have a significant impact on the recognition, measurement or presentation of lease expense within the Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income (“income statement”) or the Condensed Consolidated Statements of Cash Flows (“cash flows statement”). Information about our undiscounted future lease payments and the timing of those payments is in Note 13, “Lease Commitments,” in our Annual Report on Form 10-K. Comprehensive Income. In February 2018, the FASB issued ASU No. 2018-02, “Income Statement—Reporting Comprehensive Income (Topic 220).” This standard provides an option to reclassify stranded tax effects within accumulated other comprehensive income/(loss) (“AOCI”) to retained earnings due to the U.S. federal corporate income tax rate change in the Tax Cuts and Jobs Act of 2017. This standard is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. We have not completed our assessment, but the adoption of the standard may impact tax amounts stranded in AOCI related to our pension plans. We will adopt this standard effective January 1, 2019.